Took it out for a quick spin (essential journey for food of course). Have results..
With the jumper in place, after around half mile ish, bike will shut-down completely but the Speedo Red-AlarmBell comes on.
So I hit my switch to ground the keyless brown wire (same as clutch pull) and the bike powers back up, clocks sweep, then I can restart it via ignition or bump start in high gear.
No headlights\taillight\ABS going out on their own, just the whole bike powers off.
(Now this scenario was also happening very intermittently before, but the most common issue was the headlight/taillight/ABS circuit tripping out).
So to get back home, I removed the jumper and re-inserted fuse 8. Now I go back to the original issue where the headlight/taillight/ABS trips but bike keep running. If I want the lights back on, I have to switch off the killswitch and back on, then ground brown wire and start the bike as normal and lights are back on till it happens again.
Now it doesn't seem to happen if I pootle about, and I mean really pootling about with hardly any throttle. But no one rides like that. If I give it welly, I can almost make it happen now when revs up around 4k
Martin